The Chelsea Sour is a whiskey-based cocktail that combines the rich flavors of bourbon, lemon juice, and simple syrup. It is shaken with ice and strained into a rocks glass, often garnished with a cherry or a lemon twist. The Chelsea Sour is a classic and well-balanced drink that is enjoyed by whiskey connoisseurs. It can be found at various bars and speakeasies in Chelsea, where it is a popular choice among those looking for a strong and flavorful cocktail.